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Mixed Signal/Analog

16-Bit, 105Msps Low-Noise ADC Achieves 81.2dB SNR at Half the Power 1200mW

29th May 2008

ES Admin

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Linear Technology has introduced the LTC2217, a low noise, high performance 16-bit, 105Msps Analog to Digital Converter (ADC) with 81.2dBFS Signal-to-Noise Ratio (SNR) and 100dBc Spurious Free Dynamic Range (SFDR). Ultra-low jitter helps maintain the high SNR at high input frequencies, yielding 80.4dBFS SNR at 70MHz, while the high linearity sample/hold circuitry allows for low distortion of 92dBFS at 70MHz. The single 3.3V power supply requires less support circuitry than alternative ADCs that require two supplies. Sampling at 105Msps the LTC2217 delivers best-in-class SNR and SFDR performance while consuming only 1190mW, half the power of competing ADCs.

The LTC2217 can interface to a variety of digital systems with multiple digital output modes standard LVDS, low power LVDS, straight CMOS and demultiplexed CMOS. Additionally, an easy to use digital output randomizer is available which can dramatically reduce the effects of digital feedback from the digital outputs to the analog inputs. A separate output power supply allows the CMOS output swing to be as low as 0.5V for further noise enhancement. The LTC2217 also features an optional internal dither circuit for improved SFDR performance for low-level input signals. Both features, only offered in Linear Technology ADCs, enhance the LTC2217’s overall distortion performance in high sensitivity receiver applications.

The LTC2217 is pin-compatible with the existing 16-bit, 130Msps LTC2208 and 160Msps LTC2209 ADCs. In addition, the 16-bit 80Msps LTC2216, and 65Msps LTC2215 are also available. These low-noise 16-bit ADCs are well suited for communications applications, ATE, as well as high-end medical imaging equipment.

In addition to the new low-noise ADCs introduced today, Linear Technology currently offers a 16-bit, high performance ADC family sampling from 10Msps to 105Msps with CMOS outputs in a 7mm x 7mm QFN package. Linear’s entire high-speed ADC portfolio features industry-leading AC performance, extremely low power consumption and pin-compatibility, providing easy migration from 10-bit to 12- or 14-bits, at various sample rates. All these ADCs can sample as low as 1Msps and as high as the specified maximum sampling rate. The system footprint of the whole ADC family is exceptionally small, compared to competitive products since fewer external bypass capacitors are needed.